| 郯庐断裂带苏皖段重力变化的多尺度分解与构造活动分析 |
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| 引用本文： | 林承灏,黎哲君,徐如刚,袁泉.郯庐断裂带苏皖段重力变化的多尺度分解与构造活动分析[J].大地测量与地球动力学,2019,39(9):884-889. |
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| 作者姓名： | 林承灏 黎哲君 徐如刚 袁泉 |
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| 作者单位： | 安徽省地震局,合肥市长江西路558号,230031;安徽省地震局郯庐断裂带中南段重点研究室,合肥市长江西路558号,230031;安徽省地震局,合肥市长江西路558号,230031 |
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| 基金项目： | 国家自然科学基金;中国地震局地震科技星火计划 |
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| 摘 要： | 基于多期绝对重力与相对重力联测资料，获取不同时空尺度的郯庐断裂带苏皖段及周边地区重力场动态变化，采用小波多尺度分解方法计算不同深度的重力变化，结合区域地质构造，从深度层次的横向变化与时间尺度的纵向变化2个方面进行分析。结果表明，研究区重力变化主要由中、上地壳密度变化或断裂构造活动引起。沿郯庐断裂带苏皖段走向断裂活动分布不均，受周边深大断裂带交切作用的影响表现出明显的分段活动特征。淮阴-响水口断裂、滁河断裂等深大活动断裂带构造活动对局部重力变化具有一定的控制作用，沿断裂带走向分布有明显的重力变化梯度带；郯庐断裂带郯城-泗县段、大别山构造带霍山-六安及江苏溧阳-镇江地区在小波细节动态变化中存在重力变化梯度带异常区，但强度不高，考虑到多条深大断裂交切于此，后期需要重点关注。
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| 关 键 词： | 郯庐断裂带苏皖段 重力变化 小波多尺度分析 构造活动 |
Wavelet Multi-Scale Decomposition and Tectonic Activity Analysis of the Variation of Gravity Field in Jiangsu-Anhui Segment of Tan-Lu Fault Zone |
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| LIN Chenghao,LI Zhejun,XU Rugang,YUAN Quan.Wavelet Multi-Scale Decomposition and Tectonic Activity Analysis of the Variation of Gravity Field in Jiangsu-Anhui Segment of Tan-Lu Fault Zone[J].Journal of Geodesy and Geodynamics,2019,39(9):884-889. |
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| Authors: | LIN Chenghao LI Zhejun XU Rugang YUAN Quan |
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| Abstract: | Based on the sorting and processing of multi-periods absolute and mobile gravity data of seismic gravity monitoring network, dynamic variation results of the gravity field in different time and spatial domains are calculated for the Jiangsu-Anhui segment of Tan-Lu fault zone. Dynamic variation results of gravity field are decomposed into gravity variation details of different depth levels using the method of wavelet multi-scale decomposition. We discuss the transverse variation of different depth levels and the vertical variation of different time scales combined with regional geological tectonic features. The results indicate that the variation of regional gravity is mainly caused by density change or tectonic activity from the middle and upper crust. The distribution of tectonic activity intensity is not uniform and composed of many sub-sections along the Jiangsu-Anhui segment of Tan-Lu fault zone, influenced by the intersection with the deep fault. The tectonic activities of deep active fault zones have certain control effects on local gravity variations, such as Huaiyin-Xiangshuikou fault and Chuhe fault, because of the obvious gravity gradient zone along the fault zone. In the dynamic variation of wavelet details graph, Tancheng-Sixian section of Tan-Lu fault zone and Huoshan-Lu’an area of Dabieshan orogenic belt, and Liyang-Zhenjiang area of Jiangsu province, have gravity variation zone turns or abnormal areas, but the strength of gradient zone is not high, considering the deep tectonic background of intersection with several deep faults. |
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| Keywords: | Jiangsu-Anhui segment of Tan-Lu fault zone gravity variation wavelet multi-scale decomposition tectonic activity |
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